1)
There are, at least, two Aces, two Kings, two Queens and two Jacks.2) Every Ace borders a King and a Queen.3) Every King borders a Queen and a Jack.4) Every Queen borders a Jack.Note: "border" means "touch" horizontally or vertically, not diagonally.

Well, obviously... Those aren't four different solutions, though. If
you were to walk around the first one ninety degrees, you would see
"another" one. Since the cards' relationships are only horizontal and
vertical, the same cards border each other at every ninety degree
interval.